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Finding the Third Proportional to 7,929 and 12,191

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Solution

The third proportional to 7,929 and 12,191 is: 18,743.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,929 : 12,191 = 12,191 : x
  2. Step 2: Convert to fraction form
    7,929/12,191 = 12,191/x
  3. Step 3: Cross multiply
    7,929x = 12,191 × 12,191
  4. Step 4: Simplify right side
    7,929x = 148,620,481
  5. Step 5: Solve for x
    x = 148,620,481/7,929
  6. Step 6: Final answer
    x = 18,743.91

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.